Trusted Information Resource
All standards released by Bureau of Indian Standards(BIS) are available for free PDF download. It is easy to locate by merely Googling the Standard name followed by 'PDF' . There are also good number of International Standards, as BIS publishes many of them in India. A disclosure from Indian Government is seen in the first page indicating the purpose and obligations which sounds more on moral grounds than on regulatory. Even if available in the public domain, I am not sure if someone can download and use them.